As far as I know, if the film debuted in 2016 it is eligible to be included in Filmspots. However, since it does not release domestically (U.S. that is) until 2017, you are not likely to garner enough support for the film to gain a nomination. In that case, it will once again be eligible for Filmspots in 2017. It's dual eligibility, for films in unique cases like the ones you mention, is only ruined if it manages to get nominated for the 2016 awards.
Hopefully that clarifies things. Essentially, feel free to vote for it, but since it's not out in the US it probably won't be nominated, which is also okay because that just means it will be eligible again next year.